US1457973A - Brake and clutch operating mechanism for hoists - Google Patents

Description

BRAKE AND CLUTCH OPERATING MECHANISM FOR HOISTS Filed Sept. 50 1922 2 Sheets-Sheet l 1111111111111 7 a kvmrllll llg June 5, 11923.

W. E. HALE BRAKE AND CLUTCH OPERATING MECHANlSM FOR HOISTS Filed Sept. 30 1922 2 Sheets-Sheet 2 Patented June 5, 1223.

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WILLIAM E. HALE, 0F FORT WASHINGTON, PENNSYLVANIA, ASSIGNOR TO R. H. BEAU- MONT COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF PENN- SYLVANIA.

BRAKE AND CLUTCH OPERATING MECHANISM FOR HOISTS.

Application filed September 30, 1922. Serial No. 591,520.

To all whom it may concern:

Be it known that I, \VILLIAM E. HALE, a citizen of the United States, residin in Fort l/Vashington, Montgomery County, ennsylvania, have invented certain Improvements in Brake and Clutch Operating Mechanism for Hoists, of which the following is a specification.

My invention relates to certain improvements in brake and clutch operating mechanism for hoists, especially those having two drums.

The object of my invention is to construct the apparatus so that when one clutch is shifted to drive one drum, the brake of that drum is released automatically, while the brake of the other drum holds it from turn- This object I attain in the following manner, reference being had to the accompanyingr drawings, in which:

ig. 1 is a side view of my improved brake and clutch operating mechanism for hoists;

Fig. 2 is an end view, showing the flooring of the operators platform in section; and

Fig. 3 is a plan view of a portion of the mechanism shown in Fig. 1. I

Referring to the drawings, 1, 1 are beams forming the base of the hoist structure. 2

, and 3 are hoisting drums of the ordinary type having shafts 4 and 5, respectively, which are mounted in bearings 6 on the beams. 7 is a driving gear for each shaft. These gears are loose on the shaft. One of these gears is driven from a pinion 8 on a power driven shaft 9 having its hearings on the base of the hoist.

Each gear wheel 7 has a cone portion 10, which extends into a recess in the head 11 of each drum and forms the clutch by which the drum is driven from the gear when the drum is moved longitudinally on the shaft towards the gear. This is the ordinary construction of hoisting drums of the type to which my invention relates. In the present instance, the drums are moved to and from the gear wheel by a screw 12 mounted in a projecting portion 13 of the bearings 6 on one side of the hoist. On this screw is a cross head 14: connected to a cross head 15 by rods 16. The cross head 15 engages the hub 17 on the drum, as clearly shown in Fig. 2, so that, when the screw is turned in one direction, the drum will be forced into frictional contact with the conical portion of the gear wheel and will be driven by the gear wheel, but, when the screw is turned in the opposite direction, the drum is retracted, allowing the gear wheel to turn freely, without imparting movement to the drum.

On each screw is an arm 18. Each arm is connected to a lever 19 by rods 20. The lever is mounted on a pivot shaft 22. This pivot shaft is mounted in bearings 23 secured, in the present instance, to the under side of the operators platform 24L. Secured to the lever 19 is an operating arm 25 by which the lever and the shaft are turned.

When the operating arm is moved in the direction of the arrow, Fig. 1, the screw 12 of the drum 2 is moved in the direction of the arrow, forcing the drum in frictional contactwith the gear wheel, while the screw 12 of the drum 3 is moved in a reverse direction, withdrawing the drum from its gear wheel.

26 and 27 are brake bands, which are arranged to encircle partially portionsof the drums 2 and 3, respectively. These bands are anchored to a beam 28 located midway 'between the drums and the band 26 is attached to a lever 29 pivoted at 30, while the band 27 is attached to a lever 31 pivotedat 32. Each lever 29 and 31 is provided with a weight 33, which may be regulated as desired so as to increase or diminish the pressure of the brake bands on the drum. Each lever 29 and 31 is connected by a rod 34: to a bell crank lever 35 pivoted at 36 to any fixed point. The other arm of each bell crank lever is connected by a rod 37 to an arm 38 secured to a pivot shaft 39. On the opposite end of this shaft is a lever 40 having arms 41 connected by rods 42 to the arms of a lever 43 secured to the pivot shaft 22.

lVhen the operating arm 25 is moved in the direction of the arrow, Fig. 1, then the lever 40 is moved in the direction of its arrow, causing the brake band 26 to release the drum 2, while the brake band 27 is unaffected and remains in contact with the drum 3. When the operating arm is reversed, thcn the brake band 26 is applied and the band 27 is released.

From the above construction, it will be seen that the brakes are autmnatically re- 2. The combination in hoisting mecha-' nism, of a base; two drums mounted on the base; two gear wheels; means. for driving the gear wheels; clutch mechanism between ,from a gear Wheel; two band brakes the gear wheels and drums; mechanism for moving the drums to and from the gear wheels; screw mechanism; an arm forming part of each screw mechanism; a lever; rods connecting said lever with the arms of the two screw mechanisms; an operating rod for the lever, the parts being so arranged that when the lever is moved in one direction, one drum is moved in frictional contact with a gear wheel and the other arm is withdrawn one for each drum; a lever attached to each hand brake and rod; and lever mechanism connecting said brake levers with the operating arm so that when one drum is moved into frictional contact with its gear wheel, the brake ofthat drum is automatically released without affecting the other brake mechanism.

WILLIAM E. HALE.

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